How do you remove a flywheel without the correct locking tools?
As per the picture above you will need something that can hold the flywheel in place and stop it rotating whilst you undo the bolts.
Ive used Uni Strut as its like grownup Meccano and has elongated holes which means it lines up with the clutch bolts easily.
You could use anything, as long as it is long and strong enough to do the job.
You just nees to measure the holes where the clutch cover plate would attach and bolt it on. Then simply wedge your homebrew locking tool either against the floor or under your foot, and hey presto the flywheel is fixed in place allowing you to loosen the flywheel bolts. Simples